View Compilation Error

0_0_36473391_28681.cpp: In function 'void sol()':
0_0_36473391_28681.cpp:8:2: error: 'b' was not declared in this scope
  b[m+1]=n+1;
  ^
0_0_36473391_28681.cpp: In function 'int main()':
0_0_36473391_28681.cpp:31:19: error: 'solve' was not declared in this scope
  while(tt--)solve();
                   ^